n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | -3 |
4 | 7 |
5 | -10 |
6 | -18 |
7 | 168 |
8 | 360 |
9 | -19008 |
10 | 262080 |
11 | -2724480 |
12 | 25194240 |
13 | -232951680 |
14 | 2505444480 |
15 | -34676812800 |
16 | 577980748800 |
17 | -10296734515200 |
18 | 185178186547200 |
19 | -3347775973785600 |
20 | 62005095419904000 |
21 | -1204098364514304000 |
[0,0,1,-3,7,-10,-18,168,360,-19008,262080, -2724480,25194240,-232951680,2505444480, -34676812800,577980748800,-10296734515200, 185178186547200,-3347775973785600, 62005095419904000,-1204098364514304000] |